my 150hp 4bt overheated, so I am trying to save money on a rebuilding it. I purchased the 65hp 4b a long time ago for a parts engine. When I purchased it, I did not realize the differences between the engines. When I disassembled the 4b, I seen that this engine has almost no time on it.
I am cross referencing the parts of the 4b to use on the 4bt rebuild. I figure that any part that has less time on it, I will use for my rebuild.
The block of the 4bt is heavily grooved. I don’t know if the proper procedure is boring and buying oversized pistons on a cummins engine, or buying oversized sleeves and sleeving, or what to do. The 4b block has standard journals, and is in perfect shape, so I would like to use the 4b block instead of sending the 4bt block to a machine shop.
The cranks in both engines are standard sized, and are stamped with the same part number. The crank in the 4b block has almost no time on it. I would like to use the 4b crank
The main caps have the same part numbers on both engines, once again, I want to use the best main caps which are the 4b main caps
The connecting rods and wrist pins are the same part number on both engines, the 4b rods and wrist pins have less time on them.
The cam part numbers removed from the engines differ, but according to the parts book, the cams are the same in both CPL’s. Neither part numbers stamped on the cams match the parts book. I am doubting the cam that I removed from the 4bt was the right cam in the first place. I am trying to make sure I use the right cam on the rebuilt.
I know the pistons are different, The cup size is smaller on the 4bt thus increasing compression, I will purchase the right pistons for the 4bt
I know the injectors and cav pumps on both engines are different, I will use the 150hp pump for the 4bt.
I know the oil pumps are different for NA engines over Turbo.
I have not done any research on the heads yet. I do know to increase horsepower, you need to feed more fuel. I am assuming either the valves are differing size. I cannot find the part numbers on the heads to do a comparison, but I was just going to use the original 4bt head anyway.
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